package tech.turl.community.controller.interceptor;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.context.SecurityContextImpl;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import tech.turl.community.entity.LoginTicket;
import tech.turl.community.entity.User;
import tech.turl.community.service.UserService;
import tech.turl.community.util.CookieUtil;
import tech.turl.community.util.HostHolder;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;

/**
 * @author 
 * @date 2021/3/15
 */
@Component
public class LoginTicketInterceptor implements HandlerInterceptor {
  @Autowired private UserService userService;

  @Autowired private HostHolder hostHolder;

  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
      throws Exception {
    // 从cookie中获取凭证
    String ticket = CookieUtil.getValue(request, "ticket");

    if (ticket != null) {
      // 查询凭证
      LoginTicket loginTicket = userService.findLoginTicket(ticket);
      // 检查凭证是否有效
      if (loginTicket != null
          && loginTicket.getStatus() == 0
          && loginTicket.getExpired().after(new Date())) {
        // 根据凭证查询用户
        User user = userService.findUserById(loginTicket.getUserId());
        // 在本次请求中持有用户
        hostHolder.setUser(user);
        // 构建用户认证的结果,并存入SecurityContext,以便于Security进行授权.
        Authentication authentication =
            new UsernamePasswordAuthenticationToken(
                user, user.getPassword(), userService.getAuthorities(user.getId()));
        SecurityContextHolder.setContext(new SecurityContextImpl(authentication));
      }
    }

    return true;
  }

  @Override
  public void postHandle(
      HttpServletRequest request,
      HttpServletResponse response,
      Object handler,
      ModelAndView modelAndView)
      throws Exception {
    User user = hostHolder.getUser();
    if (user != null && modelAndView != null) {
      modelAndView.addObject("loginUser", user);
    }
  }

  @Override
  public void afterCompletion(
      HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
      throws Exception {
    hostHolder.clear();
    //        SecurityContextHolder.clearContext();
  }
}
